Accession Number : ADP005098

Title :   Electron Optical Properties and Electron Trajectories of the Multipole Magnet for BESSY,

Corporate Author : BERLINER ELEKTRONENSPEICHERRING- GESELLSCHAFT FUER SYNCHROTRONSTRAHLUNG (GERMANY F R)

Personal Author(s) : Pflueger,J. ; Klotz,W. D.

Report Date : OCT 1985

Pagination or Media Count : 4

Abstract : For the 0.8 GeV storage ring BESSY in Berlin an insertion device to be used as undulator and wiggler (0 < or = K < or + 6) is currently under construction. The pure permanent magnet structure consists of 35 periods with 7 cm period length. The influence of operating this structure with the small emittance optic METRO was studied quantitatively in linear synchrotron theory by modelling the multipole structure by hard edge dipole magnets. Working point, betatron functions etc. were studied as function of the K parameter. It turns out that vertical focussing can be compensated sufficiently well for fields < or = 12 kG by detuning the two adjacent quadrupoles. The model calculations were checked by calculating trajectories through the full three dimensional magnetic field by solving the equations of motion. As expected, vertical focussing is overestimated in the hard edge model by about 20%.

Descriptors :   *PARTICLE ACCELERATOR COMPONENTS, *PERMANENT MAGNETS, COHERENT RADIATION, SYNCHROTRONS, QUADRUPOLE MOMENT

Distribution Statement : APPROVED FOR PUBLIC RELEASE